Malicious PDF — malware analysis report

Static analysis result for SHA-256 af29e3632ab6f93b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 13:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0dc623c81e867262a5307a1142afa004 SHA-1: b7cdcf3d3e07fcee3c431a09f5250f3b209b5a2d SHA-256: af29e3632ab6f93b83ea28da8f6e7aa8f242e9d8291bfbfcd99c3e42e97be8bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm on disposable hosting, suggesting an attempt to obscure the true destination or distribute various malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=drm+license+for+android PDF link annotation
    • http://metafelix.it/userfiles/files/kimujug.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/62726014273.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/55209927168.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/59252404125.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/wozazakajim.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/98438416068.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/61771656575.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5kp54muuokjbflun91mm92v93p/34212283492.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/dakafetimojimowuwu.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/zudutuximemudemifetir.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/44205533889.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/66858272833.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/17815848367.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/gikum.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/kubapavamefoxusakuxagew.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/lajenatu.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/gipok.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/59487312969.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109061207313005.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/tibamaromuwezirike.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pewemedareguvuzusevof.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/feregogadadesimuda.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/71936884843.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/xixizi.pdfIn PDF document text
    • http://usagimatur.com/files/others/77498137069.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 10540 bytes
SHA-256: 140f419c2ed5923e34fe54d60e06c035d4d70ae3a61bd6d8b5bcd3b279ca1860
font_02_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 20204 bytes
SHA-256: 63491d73b3f9305d6ea579c1424ac5442fc95c32b189b1d0cb20bafef3da0a6a

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